Mrs. Black isn’t in and I’ll have to ring ___. I would appreciate it if you ring ____ after 6 o’clock.
| A．off; back | B．up; off | C．out; up | D．back; off |
A huge amount of oil was spilt on the East Sea，the causes of ________ are still under investigation．
| A．it | B．that | C．which | D．whom |
——Has James finished his report on his Enquiry Learning yet？
——I’m not sure．She _________ on it last week．
| A．was working | B．has worked |
| C．worked | D．had worked |
None of the underwater workers has been harmed by the great fish. ______，most fish were so friendly that they played with the instruments.
| A．Instead | B．Even though |
| C．However | D．Though |
Alibaba has become China’s largest online commercial company，______ a profit of 1.47 billion yuan in 2010.
| A．earns | B．earning |
| C．earned | D．to have earned |
——I hear that there was a terrible crash in the subway in Shanghai the other day.
——Yes，_____ news came as _____ shock to all of us.
| A．the;the | B．a;/ |
| C．the;a | D．/;a |